Natural sciences, Applied mathematics and statistics, Foundations of mathematics/Applied mathematics

Nanotechnology/Materials, Applied physics - general, General Applied Physics

Natural sciences, Mathematical physics and basic theory, Mathematical Physics/Fundamental Theory of Physical Properties

Conputer simulation

magnetic sensor

motor

Hard Disk Drive

2013 - Present
High-capacity Hard Disk Drives
hard disk drive, Study of hard disk drives for obtaining a high-capacity by using computer simulation.

次世代EV/HEV用モータの高出力化と関連材料の開発
31 Jan. 2022

モータ設計のための磁性材料特性
Single work
Sep. 2020

電磁アクチュエーターシステムのための磁性材料とその評価技術
Joint work
11 Aug. 2020

基礎から学ぶ磁性材料
Joint work
27 Mar. 2020
9784905507437

次世代EV/HEV用モータの高出力化と関連材料の開発
Contributor
31 Jan. 2020

Magnetic Material for Motor Drive Systems - Fusion Technology of Electromagnetic Fields
K. Fujisaki; D. Nicolas; A. Yao; Y. Kawazoe; F. Akagi; T. Mtuo; F. Ikeda; Y. Shindo; S. Odawara; M. Enokzono; S. Sugimoto; S. Nakajima; T. Nishiuchi; K. Oomori; S. Hirosawa; M. Sonehara; K. Yamazaki; T. Shimizu; T. Aoki; H. Wakiwaka, Joint work, 11 Magnetic domain structures and techniques in micromagnetics simulation
Springer Nature Singapore Pte Ltd., Nov. 2019
9789813299054

モータ駆動システムのための磁性材料活用技術
Joint work
27 Aug. 2018

磁気便覧
Joint work
27 Jan. 2016

Nanophotonics and Nanofabrication
F. Akagi; T. Nishida; and T. Matsumoto, Joint work
J. Wiley, Nov. 2009

3次元熱アシスト磁気記録方式における記録層の熱分布の検討
07 Dec. 2023, [Reviewed]
Last, Corresponding

Point defect generation probability considering microscopic elastic scattering cross section in rare-earth permanent magnets via first-principles calculations.
Fumiko Akagi; Ryoma Suzuki; and Tomoe Yayama
Intermag2024, 15 May 2023, [Reviewed]
Lead, Corresponding

3次元熱アシスト磁気記録方式における記録層間の磁気的相互作用の一検討
01 May 2023, [Reviewed]
Last, Corresponding

Micromagnetic Study of the Dependence of Output Voltages and Magnetization Behaviors on Damping Constant, Frequency, and Wire Length for a Gigahertz Spin Rotation Sensor
Fumiko Akagi; Terumi Kaneko; Hirotada Kan; Yoshinobu Honkura and Shinpei Honkura
Sensors, 03 Mar. 2023, [Reviewed], [Invited]
Lead

Relationship between temperature rise and thermal conductivity in a magnetic medium during heated dot magnetic recording
Fumiko Akagi; Naofumi Matsushima
Japanese Journal of Applied Physics, 14 Nov. 2022, [Reviewed]
Lead

Effects of fall times of pulse currents on output voltages in amorphous-wire-based magnetic sensors
Terumi Kaneko; Yoshinobu Honkura; Shinpei Honkura; Fumiko Akagi
IEEE Transactions on Magnetics, Aug. 2022, [Reviewed]

Theoretical study of the interfacial properties of carbon nanotube/epoxy resin nanocomposites
Yurika Serizawa; Tomoe Yayama; Fumiko Akagi
Japanese Journal of Applied Physics, 22 Apr. 2022, [Reviewed]

Effects of fall times of pulse currents on output voltages for amorphous -wire-based magnetic sensors
Terumi Kaneko; Yoshinobu Honkura; Shinpei Honkura; and Fumiko Akagi
IEEE Transaction on Magnetics, 14 Feb. 2022, [Reviewed]
Last

Point defect generation probability in rare-earth permanent magnets in radiation environments via first-principle calculations
Ryoma Suzuki; Tomoe Yayama; Fumiko Akagi
IEEE Transactions on Magnetics, 11 Jan. 2022, [Reviewed]

Effects of Static Magnetic Fields and Temperature Increase on 3D Magnetic Storage in Heated-Dot Magnetic Recording
Fumiko Akagi; Yoshito Sakamoto1; and Naofumi Matsushima
IEEE Xplore, 30 Oct. 2021, [Reviewed]
Lead

Point defect generation probability in rare-earth permanent magnets in radiation environments via first-principle calculations
Ryoma Suzuki; Tomoe Yayama; and Fumiko Akagi
IEEE Transactions on Magnetics, 31 Jan. 2021, [Reviewed]
Last

Effects of dot-position dispersion of BPM, thermal distribution, and head field gradient on bit error rate for HAMR
F. Akagi and N. Matsusima
Japanese Journal of Applied Physics, 01 Apr. 2020, [Reviewed]
Lead

マイクロ波アシスト磁気記録用スピントルク発振素子のシミュレーション
Apr. 2020, [Reviewed], [Invited]
Lead

Ultra-high sensitivity Magnetic Impedance Sensor by Applying GHz Pulse Current
F. Akagi and H. Ohta
2019 MMM digest, Nov. 2019, [Reviewed]
Lead

Analysis of the Relationship between Error Rate Performances and Grain Size Distributions for Recording Media in Heat Assisted Magnetic Recording
H. Saito; S. Uesugi and F. Akagi
2019 MMM digest, Nov. 2019, [Reviewed]
Last

HDMRにおけるドットの条件と面記録密度の関係
19 Jul. 2019, [Reviewed]

Performance Improvement of Calculation of Static Magnetic Field of Micromagnetic simulator Using Supercomputer FX10
M. Arai; F. Akagi; S. Yamaguchi; K. Yoshida
http://sighpc.ipsj.or.jp/HPCAsia2018/poster/post125s2-file1.pdf, 28 Jan. 2018, [Reviewed]

Effects of Anisotropy Field Dispersion and Grain Boundary on Coercivity and Squareness Ratio for HDDR-Processed NdFeB Powder
F. Akagi; Y. Ishii
AIP Advances 8, 056201 (2018);, 01 Jan. 2018, [Reviewed]

Effects of head-field and AC-field on magnetization reversal for microwave assisted magnetic recording
A. Kase; F. Akagi; K. Yoshida
AIP Advances 8, 056505 (2018);, 01 Jan. 2018, [Reviewed]

Effects of Anisotropy Field and Easy Axis Dispersions on Squareness Ratio for HDDR-Processed Nd-Fe-B Powders
Fumiko Akagi; R. Kariya and Yoshitake Ishii
IEEE, Jan. 2018, [Reviewed]

A study on Partial Response Equalization Systems for Heat Assisted Magnetic Recording
S. Uesugi; H. Saito; F. Akagi
ISAT 16th, 01 Nov. 2017, [Reviewed]

Relation Between High-Frequency AC Field and Heat Generated by Eddy Current
M. Ishikawa; F. Akagi
ISAT 16th, 01 Nov. 2017, [Reviewed]

Calculation Model of Magneto-Impedance Sensor Using Amorphous Wires
H. Ohta; F. Akagi
ISAT 16th, 01 Nov. 2017, [Reviewed]

デュアルSIL構造をもつSTOにおいて注入電流密度低減のためのSILの飽和磁化及び膜厚
09 Jun. 2017, [Reviewed]

マイクロマグネティクスを用いた電磁鋼板の磁区構造解析
02 Jun. 2017, [Reviewed]

マイクロ波アシスト磁気記録におけるスピントルク磁界のFGL印加領域の検討
01 Oct. 2016, [Reviewed]

Increase in AC-Field Frequency and Recording Performance in Microwave-Assisted Magnetic Recording
R. Koga; F. Akagi; K. Yoshida
J. Magn. Soc. Jpn., 01 Mar. 2016, [Reviewed]

Analysis of NdFeB Bonded Magnet Behaviors Within High-Frequency Field and High Temperature Using Micromagnetic Simulator
F. Akagi; Y. Honkura
IEEE Transactions on Magnetics, 01 Nov. 2015, [Reviewed]

マイクロ波アシスト磁気記録におけるヘッド・媒体系のダンピング定数及びスピントルク磁界がSTOの発振特性に及ぼす影響
11 May 2015, [Reviewed]

Head and Granular media for Thermally Assisted Magnetic Recording for Recording Density of 6 Tb/in2
F. Akagi; J. Ushiyama; A. Ayano; and H. Miyamoto
IEEE Trans. on Magn., 15 Jul. 2013, [Reviewed]

8Tb/in2-class Bit-patterned Medium for Thermally Assisted Magnetic Recording
J. Ushiyama; F. Akagi; A. Ayano; and H. Miyamoto
IEEE Trans. on Magn., 15 Jul. 2013, [Reviewed]

Read-head Conditions for Obtaining Areal Recording of 5 Tb/in2 on a Bit-Patterned Medium
F. Akagi; J. Ushiyama; H. Miyamoto; and S. Mita
Jpn. J. Appl. Phys., 2013, [Reviewed]

Integrated head design using a nanobeak antenna for thermally assisted magnetic recording.
T. Matsumoto F. Akagi; M. Mochizuki; H. Miyamoto; B. Stipe.
OPTICS EXPRESS, Aug. 2012, [Reviewed]

Thermally Assisted Magnetic Recording with Bit Patterned Media to Achieve Areal Recording Density beyond 5 Tb/in2.
F. Akagi; M. Mukoh; M. Mochizuki; J. Ushiyama; T. Matsumoto; H. Miyamoto.
Journal of Magnetism and Magnetic Materials, Jan. 2012, [Reviewed]

Comparison of Dual and Thermal Gradient Recording for Thermally Assisted Magnetic Recording.
F. Akagi; T. Matsumoto; M. Igarashi.
J. Magn. Soc. Jpn., Mar. 2009, [Reviewed]

Validity of Thermal Activation Volume Estimated by Using Wohlfarth’s Equation in Perpendicular Recording Hard Disk Media
M.Igarashi; F. Akagi; Y. Sugita.
J. Appl. Phys., Apr. 2008, [Reviewed]

Hybrid Recording on Bit-patterned Media Using a Near-Field Optical Head.
T. Nishida; T. Matsumoto; F. Akagi; H. Hieda; A. Kikitsu; K. Naito; T. Koda; N. Nishida; H. Hatano; and M. Hirata.
J. Nanophotonics, Dec. 2007, [Reviewed]

Validity of Thermal Activation Volume Estimated by Using Wohlfarth's Equation in Perpendicular Recording Hard Disk Media
M. Igarashi; F. Akagi; and Y. Sugita
J. Appl. Phys., Nov. 2007, [Reviewed]

Effect of Switching Field Gradient for Thermally Assisted Magnetic Recording
F. Akagi; T. Matsumoto; and K. Nakamura
J. Appl. Phys., Apr. 2007, [Reviewed]

Thermal Activation Volume in Perpendicular Recording Media with Dispersions of Grain Size
M. Igarashi; F. Akagi; and Y. Sugita
IEEE Trans. Magn., Oct. 2006, [Reviewed]

Computer Simulation of Granular Perpendicular Recording Media with Dispersions of Grain size and Grain Separation
M. Igarashi; F. Akagi; M. Hara; A. Nakamura; Y. Hosoe; and Y. Sugita
IEEE Trans. Magn., Oct. 2005, [Reviewed]

Optimum Timing and Position of Light Irradiation for Thermally Assisted Perpendicular Recording.
F. Akagi; M. Igarashi; A. Nakamura; M. Mochizuki; H. Saga; T. Matsumoto; and K. Ishikawa
Jpn. J. Appl. Phys., Nov. 2004, [Reviewed]

Thermal Stability and Read-Write Performance of AFC Media
F. Akagi; and M. Igarashi
Jpn. Appl. Phys., Sep. 2002, [Reviewed]

Monte Carlo Simulation of Thermal Activation Volume in Longitudinal Hard-Disk Drives Media
M. Igarashi; F. Akagi; and Y. Sugita
J. Appl. Phys., May 2002, [Reviewed]

Thermal Stability in Longitudinal Thin Film Media
M. Igarashi; F. Akagi; K. Yoshida; Y. Nakatani; and N. Hayashi
IEEE Trans. Magn., Jul. 2001, [Reviewed]

Effect of Angle Dependent Attempt Frequency on Arrhenius-Neel Thermal Decay in Thin Film Media
M. Igarashi; F. Akagi; K. Yoshida; and Y. Nakatani
IEEE Trans. Magn., Sep. 2000, [Reviewed]

熱揺らぎを考慮した必要記録ヘッド磁界の検討
Apr. 2000, [Reviewed]

Computer Simulation of Magnetization Switching Behavior in High-Data-Rate Hard-Disk Media
M. Igarashi; F. Akagi; A. Nakamura; H. Ikekame; H. Takano; and K. Yoshida
IEEE Trans. Magn., Jan. 2000, [Reviewed]

Optimum Writing Field for High-Frequency Magnetic Recording
M. Igarashi; F. Akagi; K. Yoshida; A. Nakamura; Y. Maruyama; and H. Takano
IEEE Trans. Magn., Sep. 1999, [Reviewed]

高周波記録に及ぼす媒体ダンピング定数αの影響
Apr. 1999, [Reviewed]

Computer Simulation of MR Response to Transverse Magnetic Fields
K. Fujimoto; K. Totsuka; Y. Uesaka; I. Saitoh; H. Fukui; F. Akagi; I. Yoshihara; Y. Nakatani; and N. Hayashi
IEEE Trans. Magn., May 1997, [Reviewed]

長手記録方式のオーバライト機構の計算機解析
Jan. 1994, [Reviewed]

Read/Write Simulation of Ba-Ferrite Particulate Media
M. Tsutsumi; F. Kugiya; N. Kodama; M. Suzuki; M. Koizumi; F. Akagi; and D. E. Speliotis
J. Appl. Phys., Apr. 1991, [Reviewed]

Magnetization Model for R/W Simulation of Acicular Particulate Media
M. Tsutsumi; F. Kugiya; F. Akagi; and I. Matsuyama
IEEE Trans. Magn., Sep. 1990, [Reviewed]

媒体磁気特性を考慮した記録磁界の計算
Apr. 1988, [Reviewed]

Influence of Oxygen Recording Characteristics in Vacuum- Evaporated Co-Cr Thin Films
F. Kugiya; M. Suzuki; F. Kanno; K. Yoshida; O. Kitakami; H. Fuiwara and D. E. Speliotis
J. Appl. Phys., Apr. 1988, [Reviewed]

Switching Mechanism of Co-Cr Films with Ge Underlayer
F. Kugiya; M. Koizumi; F. Kanno; M. Suzuki; Y. Honda; M. Futamoto; and K. Yoshida
IEEE Trans. Magn., Sep. 1987, [Reviewed]

Head Saturation Effects in Perpendicular and Longitudinal Recording
F. Kugiya; M. Koizumi; F. Kanno; Y. Uesaka; T. Okuwaki; T. Tamura; D. E. Speliotis
IEEE Trans. Magn., Sep. 1985, [Reviewed]

EV用モーターの磁石材料における環境負荷低減（小型化、脱レアアース）の可能性
10 Mar. 2018, [Invited]

田村尚也, 赤城文子, BPMを用いた熱アシスト磁気記録方式において，熱分布とヘッド磁界強度の立ち上がり時間がビットエラーレートに及ぼす影響
04 Jun. 2015

マイクロ波アシスト記録におけるダンピング定数が発振磁界に及ぼす影響及び発振磁界増大方法についての検討
25 Nov. 2014

マイクロ波アシスト記録方式において、STO に印加される外部磁界 が発振磁界に及ぼす影響
20 Jul. 2014

Head and Granular Media for Thermally Assisted Magnetic Recording for Recording Density of 6 Tb/in2
F. Akagi; A. Ando; J. Ushiyama; and H. Miyamoto
MMM-Intermag 2013, Jan. 2013

8Tb/in2-class Bit-patterned Medium for Thermally Assisted Magnetic Recording
J. Ushiyama; F. Akagi; A. Ando; and H. Miyamoto
MMM-Intermag 2013, Jan. 2013

Read-Head Conditions with Bit Patterned Media for Areal Recording Density More Than 5 Tb/in2
F. Akagi; J. Ushiyama; H. Miyamaoto; and S. Mita
Intermag 2012, May 2012

Integrated Head Design for Thermally Assisted Magnetic Recording
T. Matsumoto; M. Mochizuki; F. Akagi; Y. Iwanabe; H. Takei; H. Nemoto; H. Miyamoto; and B. Stipe
Intermag 2012, May 2012

Thermally-assisted Magnetic Recording Technologies toward 2.5 Tb/in2 and beyond
H. Miyamoto; F. Akagi; H. Nemoto; Y. Iwanabe; M. Mukoh; J. Ushiyama; T. Matsumoto; and B. Stipe
MORIS 2011, Jun. 2011

Integrated Head Design for Thermally Assisted Magnetic Recording
T. Matsumoto; F. Akagi; M. Mochizuki; Y. Iwanabe; H. Takei; H. Nemoto; H. Miyamoto; and B. Stipe
Intermag 2011, Apr. 2011

Thermally Assisted Magnetic Recording with Bit Patterned Media to Achieve Areal Recording Density berond 5 Tb/in2
F. Akagi; M. mukoh; M. Mocizuki; J. Ushiyama; T. Matsumoto; and H. Miyamaoto
PMRC(Perpendicular Magnetic Recording Conference), May 2010

Integrated Head Design for Thermally Assisted Magnetic Recording
T. Matsumoto; F. Akagi; M. Mochizuki H. Takei; Y. Iwanabe; M. Mukoh; I. Naniwa; Y. Okura; A. Hirotsune; H. Nemoto; J. Ushiyama; and H. Miyamoto
PMRC, May 2010

Integrated Head Design for Thermally Assisted Magnetic Recording
T. Matsumoto; M. Mochizuki; F. Akagi; I. Naniwa; Y. Iwanabe; H. Takei; and H. Miyamoto
MMM-Intermag 2010, Jan. 2010

Thermally Assisted Magnetic Recording toward Terabit-class HDD
T. Matsumoto; I. Naniwa; H. Nemoto; F. Akagi; and H. Miyamoto
TMRC(The Magnetic Recording Conference)2009, Oct. 2009

Exchange Coupled Double Layer Medium for Thermally Assisted Magnetic Recording
F. Akagi
MORIS 2009, Jun. 2009

Thermally Assisted Magnetic Recording
T. Matsumoto; J. Shimizu; I. Naniwa; Y. Iwanabe; S. Arai; T. Takahashi; S. Sasaki; S. Nakamura; F. Akagi; and H. Miyamoto
MORIS 2009, Jun. 2009

Integrated Optical System for Thermally Assisted Magnetic Recording
T. Matsumoto; J. Shimizu; I. Naniwa; S. Arai; S. Satoh; S. Nakamura; T. Iwasaki; T. Takahashi; F. Akagi; and H. Miyamoto
MIPE 2009, Jan. 2009

Comparison of Dual and Thermal Gradient Recording for Thermally Assisted Magnteic Recording
F. Akagi; T. Matsumoto; and M. Igarashi
Intermag 2008, May 2008

Hybrid Recording on Bit-patterned Media Using a Near-Field Optical Head.
T. Nishida; F. Akagi; and T. Matsumoto
ISOM(International Symposium on Optical Memory) 2007, Dec. 2007

Validity of Thermal Activation Volume Estimated by Using Wohlfarth's Equation in Perpendicular Recording Hard Disk Media
M. Igarashi; F. Akagi; and Y. Sugita
MMM 2007, Nov. 2007

Validity of Thermal Activation Volume Estimated by Using Wohlfarth's Equation in Perpen dicular Recording Hard Disk Media
M. Igarashi; F. Akagi; and Y. Sugita
PMRC 2007, Oct. 2007

Effect of Switching Field Gradient for Thermally Assisted Magnetic Recording
F. Akagi; T. Matsumoto; and K. Nakamura
10th Joint MMM-Intermag, Jan. 2007

Near-field Optical Prove with a Beaked Metallic Plate for Thermally Assisted Magnetic Recording
T. Matsumoto; Y. Anzai; F. Akagi; T. Shintani; K. Nakamura; and T. Nishida
MORIS 2006, Jun. 2006

Micromagnetic Simulation of Thermal Activation Volume in Perpendicular Recording Media with Dispersions of Grain Size
M. Igarashi; F. Akagi; and Y. Sugita
Intermag 2006, May 2006

Computer Simulation of Granular Perpendicular Recording Media with Dispersions of Grain size and Grain Separation
M. Igarashi; F. Akagi; M. Hara; A. Nakamura; Y. Hosoe; and Y. Sugita
Intermag 2005, Apr. 2005

Thermal Stability and Read-Write Performance of AFC Media
F. Akagi; and M. Igarashi
Intermag 2002, Apr. 2002

Relation between Magnetic Cluster Size and Thermal Swithing Volume in HDD Media
M. Igarashi; F. Akagi; and Y. Sugita
Intermag 2002, Apr. 2002

Restructuring Simulation in Antiferromagnetically Couled Media
M. Igarashi; F. Akagi; F. Tomiyama; H. Zaitsu; Y. Hirayama; and Y. Hosoe
46th MMM, Nov. 2001

Monte Carlo Simulation of Thermal Activation Volume in Longitudinal HDD Media
M. Igarashi; F. Akagi; and Y. Sugita
46th MMM, Nov. 2001

Estimation of Thermal Fluctuation in High-Density Hard Disk Media
M. Igarashi; F. Akagi
The 8th Joint MMM-intermag, Jan. 2001

Micromagnetic Study of the Relation between Thermal Stability and the Energy Barrier Height KuV in Longitudinal Thin Film Media
M. Igarashi; F. Akagi; K. Yoshida; Y. Nakatani; and N. Hayashi
The 8th Joint MMM-intermag, Jan. 2001

Computer Simulation of Thermal Activation Volume in High-Density HDD Media
M. Igarashi; F. Akagi; M. Hara; and Y. Sugita
PMRC 2000, Oct. 2000

Effect of Angular Dependent Attempt Frequency on Arrhenius-Neel Thermal Decay in Thin Film Media
M. Igarashi; F. Akagi; K. Yoshida; and Y. Nakatani
Intermag 2000, Apr. 2000

Computer Simulation of High-Speed Magnetization Switching Hard Disk Media
M. Igarashi; F. Akagi; A. Nakamur; H. Ikekame; K. Yoshida; and Y. Sugita
Intermag 2000, Apr. 2000

Analysis of The Attempt Frequency Dependence on External Filed
M. Igarashi; F. Akagi; K. Yoshida; H. Ikekame; and Y.Nakatani
MMM '99, Nov. 1999

Computer Simulation of Magnetization Switching Behavior in High-Data-Rate Hard-Disk Media
M. Igarashi; F. Akagi; A. Nakamura; H. Ikekame; and H. Takano
TMRC '99, Aug. 1999

Optimum Writing Field for High-Frequency Magnetic Recording
M. Igarashi; F. Akagi; K. Yoshida; A. Nakamura; Y. Maruyama; and H. Takano
Intermag '99, May 1999

Magnetization Model for R/W Simulation of Acicular Particulate Media
F. Kugiya; F. Akagi; and M. Tsutsumi
Intermag '90, Apr. 1990

A Study on Magnetization Model for Particulate Media
F. Kugiya; F. Kanno; and M. Tsutsumi
Intermag '89, May 1989

Influence of Oxygen Recording Characteristics in Vacum Evaporated Co-Cr Thin Films
F. Kugiya; M. Suzuki; F. Kanno; K. Yoshida; O. Kitakami; H. Fujiwara; and D. E. Speliotis
32nd MMM, Nov. 1987

Head Saturation Effects in Perpendicular and Longitudinal Recording
F. Kugiya; M. Koizumi; F. Kanno; Y. Uesaka; T. kuwaki; and T. Tamura; D.E. Speliotis
Intermag 1985, May 1985

機械学習を使用したエアロゾルの物体検出
20 Aug. 2024

固定子分割型可変磁力モータのトルク解析
15 Mar. 2024

２つのエアギャップ領域をもつEV用可変磁力モーターのトルク解析
木庭隆伸; 赤城文子
COMSOL CONFERENCE2023, 08 Dec. 2023

3 次元熱アシスト磁気記録方式における記録層の熱分布の検討
07 Dec. 2023

同期リラクタンスモータの初期位相計算
大槻圭吾、赤城文子
第一原理計算による熱アシスト磁気記録用媒体の熱特性の研, 04 Nov. 2023

Microscopic structural analysis of carbon nanotubes/epoxy composites using molecular dynamics
Tenma Hiraishi; Tomoe Yayama; Fumiko Akagi
第42回電子材料シンポジウム, 12 Oct. 2023

Evaluation of magnetic moment and magnetocrystalline anisotropy of magnetic materials using first-principles calculation
Reiji Namiki; Tomoe Yayama; Fumiko Akagi
第42回電子材料シンポジウム, 12 Oct. 2023

Magnetic moment and magnetocrystalline anisotropy energy of Fe, Ni, and Co using first-principles calculations.
F. Akagi; R. Namki; and T. Yayama
日本磁気学会学術講演会2,023シンポジウム, 27 Sep. 2023, [Invited]

カーボンナノチューブ/エポキシ樹脂ナノコンポジットの界面電子状態と機械的特性の関係
22 Sep. 2023

磁性入門講座 磁性の用途・種類・特徴から硬磁性・軟磁性の材料とその特徴
08 Jun. 2023

Generation probability of point defects considering microscopic elastic scattering cross-sections in rare-earth permanent magnets via first-principles calculations
F. Akagi; R. Suzuki; and T. Yayama
Intermag 2023, 19 May 2023

磁性材料セミナー 磁性材料の基礎
09 Feb. 2023

アモルファスワイヤを用いた磁気センサの LLG 解析
12 Dec. 2022

第一原理計算による熱アシスト磁気記録用媒体の熱特性の研究
芹澤百合香、屋山巴、赤城文子
第一原理計算による熱アシスト磁気記録用媒体の熱特性の研, 12 Nov. 2022

点欠陥のあるカーボンナノチューブとエポキシ樹脂ナノコンポジットの引張強度の研究
04 Nov. 2022

3次元熱アシスト磁気記録方式における記録層の膜厚と層間のスペーシングの検討
04 Nov. 2022

RELATIONSHIP BETWEEN TEMPERATURE RISE AND THERMAL CONDUCTIVITY IN MAGNETIC MEDIUM FOR HEATED DOT MAGNETIC RECORDING
Fumiko Akagi; Naofumi Matsushima
MORIS2022, 17 May 2022

これだけは押さえておきたい磁性応用のための入門講座
24 Mar. 2022

マイクロマグネティクスシミュレーションによる軟磁性材料の一考察
21 Mar. 2022, [Invited]

磁性材料セミナー 磁性材料の基礎
21 Feb. 2022

磁性入門講座 磁性の用途・種類・特徴から硬磁性・軟磁性の材料とその特徴
21 Jan. 2022

Point defect generation probability in rare-earth permanent magnets in radiation environments via first-principle calculations
Ryoma Suzuki; Tomoe Yayama; and Fumiko Akagi
MMM-Intermag2022, Jan. 2022

Effects of fall times of pulse currents on output voltages for amorphous -wire-based magnetic sensors
Terumi Kaneko; Yoshinobu Honkura; Shinpei Honkura; and Fumiko Akagi
MMM-Intermag2022, Jan. 2022

Theoretical study on interfacial interaction,of zig-zag carbon nanotubes/epoxy resin nanocomposite
Yurika Serizawa; Tomoe Yayama; and Fumiko Akagi
International Symposium on Advanced Technology, 23 Nov. 2021, Kogakuin University

第一原理計算による宇宙環境下での利用を想定した希土類永久磁石の電子・スピン状態の評価
13 Sep. 2021

ジグザグ型単層カーボンナノチューブ/エポキシ樹脂複合材料の界面特性に関する理論的研究
11 Sep. 2021

アモルファスワイヤを用いた磁界センサにおいて励磁パルス電流の立下り時間が出力電圧に及ぼす影響
01 Sep. 2021

EFFECTS OF STATIC MAGNETIC FIELDS AND TEMPERATURES ON 3D MAGNETIC STORAGE IN HDMR
Fumiko Akagi; Yoshito Sakamoto; and Naofumi Matsushima
Intermag2021, 26 Apr. 2021, The IEEE Magnetics Society

Two-stage Signal Processing Schemes for Heated Dot Magnetic Recording with Polar Coding and Double-Layered Bit Patterned Media
Hidetoshi Saito and Fumiko Akagi
IEEE International Magnetics Conference (Intermag 2021), 26 Apr. 2021

環境負荷低減（小型化、脱レアアース）を目指したEV用モータの磁石材料の研究とその可能性
15 Mar. 2021

HDMRにおいて高記録密度達成のためのドットのばらつきの条件
17 Dec. 2020

Influence of static magnetic field from recording medium and oscillating magnetic field components on recording for MAMR
18 Mar. 2020

Magnetic properties and dot conditions of medium for achieving high recording density in HDMR
18 Mar. 2020

磁性材料を扱うために知っておきたい基本知識
28 Feb. 2020

磁性材料入門セミナー～磁性の基礎から軟磁性・硬磁性材料の特徴と応用例～
19 Dec. 2019

磁性材料の基礎－磁性の基本的性質、軟磁性と硬磁性の特徴－
28 Nov. 2019

Analysis of the relationship between error rate performances and grain size distributions for recording media in heat assisted magnetic recording
Hidetoshi Saito; Sho Uesugi and Fumiko Akiagi
The 2019 Annual Conference on Magnetism and Magnetic Materials (MMM 2019), 08 Nov. 2019, AIP Publishing, IEEE Magnetics Society

Analysis of the Relationship between Error Rate Performances and Grain Size Distributions for Recording Media in Heat Assisted Magnetic Recording
H. Saito; S. Uesugi and F. Akagi
2019 MMM, Nov. 2019, The IEEE Magnetics Society

Ultra-high sensitivity Magnetic Impedance Sensor by Applying GHz Pulse Current
F. Akagi; H.Ohta
MMM２０１９, Nov. 2019

Effects of dispersions of magnetic dot size, dot position and Curie temperature on bit error rate in heated dot magnetic recording
N. Matsusima
IFAEE, 30 Oct. 2019, Kogakui University

Influence of static magnetic field from recording medium to STO on recording for MAMR
K. Kurita and F. Akagi
Sep. 2019

HDMRにおける高記録密度化のためのドットとBARの条件
松島 直史,赤城 文子
DISKCON 2019, 25 Jul. 2019, IDEMA Japan

HDMRにおけるドットの条件と面記録密度の関係
19 Jul. 2019

Effects of dot-position dispersion of BPM, thermal distribution, and head field gradient on bit error rate for HAMR
F. Akagi and N. Matsusima
MORIS2019, 24 Jun. 2019, JSPS144委員会

MAMRにおいて記録媒体からSTOへの静磁界が記録に与える影響
22 Mar. 2019

これだけは押さえておきたい磁性応用のための入門講座
19 Feb. 2019

Near field transducer for heat assisted magnetic recording
吾妻滉太; 赤城文子
COMSOL CONFERENCE2018, 08 Dec. 2018

Improving performance of transposition algorithm of 3-D data array for parallelization using message passing interface
M. Arai; F. Akagi; S. Yamaguchi; K. Yoshida
CANDAR2018, 29 Nov. 2018

Issues with Micromagnetic Numerical Simulations of Magnetic Structures of Soft Magnetic Materials for Electric Vehicles
The42th Annual Conference on MAGNETICS in Japan Symposium, 13 Sep. 2018, [Invited]

Relation between Anisotropy Field and Temperature Rise Caused by AC Field Applied to Nd-Fe-B Permanent Magnet
M. Ishikawa; F. Akagi; K. Yoshida
ICM2018, 28 Jul. 2018, IEEE Magnetics

Effects of static and exchange fields on magnetization reversaltime with different damping constants in soft magnetic material
H. Ohta; F. Akagi; K. Yoshida
ICM2018, 28 Jul. 2018, IEEE Magneitcs

負の磁気異方性をもつFGLとデュアルSIL構造が注入電流密度に与える低減効果
栗田佳典; 崔宰榮; 加瀬愛菜; 赤城文子; 吉田和悦
DISKCON2018, 21 Jun. 2018, IDEMA JAPAN, [Invited]

大容量磁気ディスク装置のマイクロマグネティクスシミュレーション
21 Jun. 2018

Effects of Anisotropy Field and Easy Axis Dispersions on Squareness Ratio for HDDR-Processed Nd-Fe-B Powders
F. Akagi; T. Shirai; R. Kariya
2018 Intermag Conference, 26 Apr. 2018, IEEE

磁性材料入門セミナー 磁性の基礎から軟磁性・硬磁性材料の特徴と応用例
20 Apr. 2018

熱アシスト磁気記録において高記録密度化達成のための媒体のドット間空隙とドット径のばらつきの検討
22 Mar. 2018

マイクロ波アシスト磁気記録方式においてFGLの負の磁気異方性定数が発振磁界に与える影響
21 Mar. 2018

MAMRにおけるSTOのダンピング定数とアシスト効果の関係
21 Mar. 2018

これだけは押さえておきたい磁性応用のための入門講座
15 Feb. 2018

Performance Improvement of calculation of Static Magnetic Field of Micromagnetic Simulator Using Supercomputer FX10
M. Arai; F. Akagi; S. Yamaguchi; K. Yoshida
HPC Asia 2018, 29 Jan. 2018, •HPC Asia Steering Committee

Effects of head and AC field on magnetization reversal for MAMR
F. Akagi; A. Kase; K. Yoshida
ASRC Winter Review Meeting, 04 Dec. 2017

Effects of Anisotropy Field Dispersion and Grain Boundary on Coercivity and Squareness Ratio for HDDR-Processed NdFeB Powders
F. Akagi; Y. Ishii
2017 MMM Conference, 09 Nov. 2017, MMM

Effects of head-field and AC-field on magnetization rversal for microwave assisted magnetic recording
A. Kase; F. Akagi; K. Yoshida
2017 MMM Conference, 09 Nov. 2017

A Study on Partial Response Equalization Systems for Heat Assisted Magnetic Recording
S. Uesugi; H. Saito; F. Akagi
ISAT 16th, 02 Nov. 2017

Relation Between High-Frequency AC Field and Heat Generated by Eddy Current
M. Ishikawa; F. Akagi
ISAT 16th, 02 Nov. 2017

Calculation Model of Magneto-Impedance Sensor Using Amorphous Wires
H. Ohta; F. Akagi
ISAT 16th, 02 Nov. 2017

デュアルSIL構造をもつSTOの注入電流密度低減効果
01 Sep. 2017

Effect of exchange stiffness constant on recessino of magnetization in FGL in case of 2.5 nm-thickness for applying spin torque field in FGL
F. Akagi; A. Kase; K. Yoshida
ASRC Summer Review Meeting, 14 Jun. 2017

デュアルSIL構造をもつSTOにおいて注入電流密度低減のためのSILの飽和磁化及び膜厚
09 Jun. 2017

マイクロマグネティクスを用いた電磁鋼板の磁区構造解析
02 Jun. 2017

デュアルSIL構造をもつSTOにおいて注入電流密度低減のためのSILの飽和磁化及び膜厚
22 Mar. 2017

ECCビットパターン媒体を用いた熱アシスト磁気記録方式におけるヘッド磁界強度低減の検討
22 Mar. 2017

熱アシスト磁気記録におけるパーシャルレスポンス信号処理方式の検討
22 Mar. 2017

Ms and Thickness of Right SIL Dependence of AC-Field for Dual Spin Injection Layers
F. Akagi; A. Kase; T. Kamimura; K. Kazuetsu
ASRC Winter Review Meeting, 06 Dec. 2016, ASRC

High Areal Dentisy Digital Magnetic Recording Schemes Based on Heat Assisted Magnetic Recording
S. Uesugi; H. Saito; and F. Akagi
The 15th International Symposium on Advanced Technology, 10 Nov. 2016, ISAT

マイクロ波アシスト磁気記録におけるスピン注入層に印加されるスピントルク磁界が発振磁界に及ぼす影響
01 Nov. 2016

熱アシスト磁気記録に対するディジタル信号処理方式の一検討
21 Sep. 2016

Effects of deterioration of grain suraface-layer and grain boundary on magnetic property for neodimium permanent magnet
F. Akagi; Y. Sakai; Y. Honkura
The 40th Annual Conference on MAGNETICS in Japan, 07 Sep. 2016, MSJ

Dual Spin Injection Layers,ASRC Summer Review Meeting
F. Akagi; A. Kase; K. Kazuetsu
14 Jun. 2016

マイクロ波アシスト磁気記録におけるスピン注入層が発振磁界に及ぼす影響
15 Mar. 2016

マイクロ波アシスト磁気記録におけるスピン注入層に印加されるスピントルク磁界が発振磁界に及ぼす影響
15 Mar. 2016

マイクロ波アシスト磁気記録におけるスピントルク磁界の印加領域が発振特性に及ぼす影響
15 Mar. 2016

ビットパターン媒体を用いた熱アシスト磁気記録方式におけるドット径と位置のばらつきがビットエラーレートに及ぼす影響
15 Mar. 2016

熱アシスト磁気記録と瓦書き記録を組合わせた方式におけるヘッド磁界勾配とBPMのドット位置分散の検討
15 Mar. 2016

マイクロマグネティック計算に依拠した渦電流発熱計算
09 Sep. 2015

MH Loop Modeling of NdFeB Anisotropic Bonded Magnet
Fumiko Akagi and Yoshinobu Honkura
The 39th Annual Conference on MAGNETICS in Japan, Energy Magnetics improving motor efficiency, 09 Sep. 2015, Magnetic Society Japan

BPMを用いた熱アシスト磁気記録方式において，熱分布とヘッド磁界強度の立ち上がり時間がビットエラーレートに及ぼす影響
05 Jun. 2015

Increasing AC-Field Frequency in Microwave-Assisted Magnetic Recording
Riki Koga; Fumiko Akagi and Kazuetsu Yoshida
Intermag 2015 Beijing, 14 May 2015, IEEE

Analysis of Magnet Behavior within High Frequency Field and High Temperature Using Micromagnetics Simulator
Fumiko Akagi and Yoshinobu Honkura
Intermag 2015 Beijing, 14 May 2015, IEEE

マイクロ波アシスト磁気記録における媒体の磁気異方性定数が磁化状態に及ぼす影響
12 Mar. 2015

マイクロ波アシスト磁気記録方式における高周波磁界発生素子の負の磁気異方性が発振磁界に及ぼす影響
12 Mar. 2015

マイクロマグネティクスの最近の研究（Analysis of Magnetic Fatigue Strength Using Micromagnetics simulator
18 Dec. 2014

マイクロ波アシスト記録における発振磁界増大方法の検討
04 Dec. 2014

マイクロ波アシスト記録におけるダンピング定数が発振磁界に及ぼす影響及び発振磁界増大方法についての検討
25 Nov. 2014

Effects of Head Field Rise Time on Bit Error Rate,for Heat Assisted wagnetic Recording Combined Bit Patterned Media
Naoya Tamura and Fumiko Akagi
SPACC-21 IFAEE-1, 02 Nov. 2014, SPACC

Analysis of Magnetic Fatigue Strength Using Micromagnetics Simulator
Fumko Akagi and Yoshinobu Honkura
ICAUMS 2014 Symposium "Session 4A:Hard Magnetic Materials, 31 Oct. 2014, AUMS

Magnet Behavior in High Frequency Field Using Micromagnetic Simulato
Fumko Akagi and Yoshinobu Honkura
The38th Annual Conference on MAGNETICS in Japan Symposium "Magnetic materials used for high speed motors”, 04 Sep. 2014, MSJ

マイクロ波アシスト記録における発振磁界の振幅増大方法の検討
03 Sep. 2014

BPMを用いた熱アシスト磁気記録においてビットエラーレートに及ぼすヘッド磁界の立上り時間の影響
03 Sep. 2014

Influences of Damping Constants of Writer and Recording Medium ,Influences of Damping Constants of Writer and Recording Medium on Oscillation Behaviors of STO in MAMR
The 21th Symposium of MSJ Optical Functional Magnetic devices and Materials, 11 Jul. 2014

MicroMagneticsによる磁石の高周波特性機構の解明
02 Jul. 2014

マイクロ波アシスト磁気記録における記録ヘッド及び媒体のダンピング定数がSTOの発振特性に及ぼす影響
18 Mar. 2014

Head and Granular Media for Thermally Assisted Magnetic Recording for Recording Density of 6 Tb/in2.
F. Akagi; A. Ando; J. Ushiyama; H. Miyamoto.
MMM-Intermag2013, Jan. 2013, AIP IEEE

8-Tb/in2 Bit-patterned Medium for Thermally Assisted Magnetic Recording.
J. Ushiyama; F. Akagi; A. Ando; H. Miyamoto.
MMM-Intermag 2013, Jan. 2013, AIP IEEE

5Tb/in2超エネルギーアシスト記録
Sep. 2012

Read-Head Conditions with Bit Patterned Media for Areal Recording Density More Than 5 Tb/in2.
F. Akagi; J. Ushiyama; H. Miyamoto and S. Mita.
Intermag2012, May 2012, IEEE

Integrated Head Design for Thermally Assisted Magnetic Recording.
T. Matsumoto; M. Mochizuki; F. Akagi; Y. Iwanabe; H. Takei; H. Nemoto; H. Miyamoto; B. Stipe.
Intermg2012, May 2012, IEEE

エネルギーアシスト磁気記録及びナノアドレッシング装置技術
May 2012

Integrated Head Design for Thermally Assisted Magnetic Recording.
T. Matsumoto; F. Akagi; M. Mochizuki; Y. Iwanabe; H. Takei; H. Nemoto; H. Miyamoto; B. Stipe.
Intermag 2011, Apr. 2011, IEEE

Integrated Head Design for Thermally Assisted Magnetic Recording toward 2.5 Tb/in2-class Recording
T. Matsumoto; F. Akagi; Y. Iwanabe; H. Hisako; M. Mukoh; I; Naniwa; Y. Okura; A. Hirotsune; H. Nemoto; M. Mochizuki; and H. Miyamaoto
第34回日本磁気学会学術講演会, Sep. 2010

熱アシスト磁気記録における温度分布の検討
Sep. 2010

面記録密度1Tb/in2-2.5Tb/in2を達成するための熱アシスト磁気記録計算機シミュレーション
Jul. 2010

熱アシスト磁気記録用集積光学系の開発
Mar. 2010

熱アシスト磁気記録用集積光学系の開発
Jan. 2010

シミュレーションによるエネルギーアシスト磁気記録の検討
Mar. 2009

Comparison of Dual and Thermal Gradient Recording Method for Thermally Assisted Magnetic Recording
F. Akagi; T. Matsumoto; and M. Igarashi
第32回日本磁気学会学術講演会, Sep. 2008

Thermally Assisted Magnetic Recording Using an Optical Near-Field
T. Matsumoto; K. Nakamura; F. Akagi; T. Nishida
第31回日本応用磁気学会学術講演会, Sep. 2007

垂直記録媒体における非一斉磁化反転のマイクロマグネティクスによる検討
Jul. 2007

Computer Simulation of Thermally Assisted Magnetic Recording Method
F. Akagi; K. Nakamura; T. Matsumoto; H. Saga; M. Mochizuki; A. Nakamura; and M. Igarashi
第29回日本磁気学会学術講演会, Sep. 2005

磁気記録媒体の熱活性化体積
Jun. 2005

シミュレーションによる熱アシスト記録の検討
Dec. 2004

3層磁性膜を有するAFC媒体の計算機シミュレーション
Sep. 2004

熱アシスト磁気記録における光照射の位置とタイミングの検討
Oct. 2003

磁気クラスター寸法と磁化反転体積の関係
Jul. 2002

熱減磁に及ぼす粒径及びKu分布と交換相互作用の影響
Sep. 2000

磁気記録媒体の熱揺らぎ特性評価
Sep. 2000

熱揺らぎを考慮した必要記録ヘッド磁界の検討
Sep. 1999

シミュレーションによる高速磁気記録の検討
Jan. 1999

高周波記録に及ぼす媒体ダンピング定数αの影響
Sep. 1998

磁気特性とR/W特性に及ぼす薄膜媒体の磁気異方性分散の影響
Sep. 1996

計算機シミュレーションによる長手記録方式のオーバライト機構の解析
Mar. 1993

薄膜磁気記録媒体のオーバライトメカニズムの検討
Sep. 1992

塗布型磁気記録媒体の記録再生特性解析
Jun. 1992

塗布型媒体高密度化の検討
Mar. 1991

光学的にプリフォーマットされた磁気ディスクの高密度化（I）原理
Mar. 1990

塗布型記録媒体の磁化モデル
Sep. 1989

塗布型媒体の磁気特性と記録再生特性
Sep. 1989

塗布型記録媒体の記録再生シミュレーション
Nov. 1988

塗布型記録媒体の磁化機構の一考察
Sep. 1988

媒体磁気特性を考慮した記録磁界の計算
Sep. 1987

主磁極励磁型単磁極ヘッドの記録磁界の計算機解析
Mar. 1987

主磁極励磁型単磁極ヘッドの再生特性
Nov. 1986

リングヘッド/Co-Cr 単層膜系のオーバライト特性
Mar. 1986

垂直記録特性に及ぼすヘッド磁界分布の影響
Mar. 1985

14/060691, MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE

P2011-061220, 磁気記録媒体及び熱アシスト磁気記録装置

P7773331, PUS2008/0049357, P11/774350, 熱アシスト磁気記録装置

PZL200510073966, PCN1700324, P200510073966.9, 熱アシスト磁気記録装置

P2010-108571, P2008-281576, 熱アシスト磁気記録媒体及び磁気記録装置

PUS2010/0110576, P12/608232, 熱アシスト磁気記録媒体及び磁気記録装置

P04504960, P2008-052863, P2006-230267, 熱アシスト磁気記録装置

PUS2010/0033865, P12/537141, 磁気記録方法及び磁気記録装置

P7645528, PUS2006/0057428, P11/226971, 磁気記録媒体

P117575, P200502987-1, 熱アシスト磁気記録装置

P7446969, PUS2005/0259343, P11/134088, 熱アシスト磁気記録装置

P1600952, P602005009997.2, 熱アシスト磁気記録装置

P2008-210426, P2007-043766, 熱アシスト磁気ヘッド、磁気記録装置及び磁気記録方法

PUS2008/0204917, P12/072004, 熱アシスト磁気ヘッド、磁気記録装置及び磁気記録方法

P2008-202574, 磁気記録方法及び磁気記録装置

P04081485, P2007-128573, P2005-318511, 熱アシスト磁気記録用ヘッド及び熱アシスト磁気記録装置

P03984568, P2005-004901, P2003-168371, 磁気記録装置及び磁気記録方法

PUS2007/0096854, P11/590785, 熱アシスト記録装置用ヘッド及び熱アシスト磁気記録装置

P03884031, P2006-012249, P2004-185402, 近接場光を用いた熱アシスト磁気記録装置

P2006-085806, P2004-268399, 磁気記録媒体

P2005-332474, P2004-149477, 熱アシスト磁気記録装置

P2003-308607, P2002-109903, 磁気記録媒体及びその製造方法

P62-107409, P60-246171, 垂直磁気記録装置

P62-012920, P60-150156, 垂直磁気記録媒体

P61-052435, スイチョクキロクヨウジキヘッド

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